plz help me i swear will mark you brainiest :(

Answer:

Genetic variation

Explanation:

measure of the genetic differences that exist within a population. 

Explanation:

a) 0.4998 mol

b) 0.249 mol

Answer:

Keq = 19

ΔG° = -7.3kJ/mol

Explanation:

Based on the chemical reaction:

Glucose 1-phosphate ⇄ Glucose 6-phosphate

The equilibrium constant, Keq is defined as:

Keq = [Glucose 6-phosphate] / [Glucose 1-phosphate]

Where [] are equilibrium concentrations of each substance

Replacing:

Keq = [0.19M] / [0.01M]

Keq = 19

Now, standard free energy change, ΔG° is defined as:

ΔG° = -RT ln K

Where R is gas constant 8.314J/molK

T is absolute temperature (25°C + 273.15K = 298.15K)

and K is equilibrium constant = 19

Replacing:

ΔG° = -8.314J/molK*298.15K ln 19

ΔG° = -7299J/mol

ΔG° = -7.3kJ/mol

Answer:

number C

Explanation:

Answer:

metalloids

Explanation:

I think that is the answer

According to the electronic configuration, group 14 of elements can act as semiconductors.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

GAY-LUSSAC'S LAW.

Explanation:

P1 = 765 torr

T1 = 23°C = 296K

P2 = 560. torr

T2 = ?

(765 torr)/(296K) = (560. torr)/ T2

T2 = 226 K = -57°C

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore the new temperature is  -57°C. the law that is used over here is Gay-Lussac's Law.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Ideal gas is only for ideal gas.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

P1 = 765 torr

T1 = 23°C = 296K

P2 = 560. torr

T2 = ?

Applying Gay-Lussac's Law

(765 torr)/(296K) = (560. torr)/ T2

T2 = 226 K = -57°C

Therefore the new temperature is  -57°C. the law that is used over here is Gay-Lussac's Law.

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Answer:

3, 4 ,1

Explanation:

Answer:

0.075 moles n=m/M so divide the mass (m) by the molar mass (M) to get the n which is the number of moles

Explanation:

Answer:

A: False

Explanation:

B: True

C: part of earths mantle.

Answer:

Im going to say sleep

Explanation:

Answer:

O C4H8

Explanation:

Explanation:

1) Einsteinium

2) Albert Einstein

Answer:

Einsteinium, Rutherfordium, Nobelium, Curium etc are some examples of elements named after scientists

When a molecule is separated into its components it forms atoms as molecules are made up of same or different kind of atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

less polution

Explanation:

Answer:

O low ionization energy and more than 4 valence electrons

Explanation:

please Mark as BRAINLIST answer

Elements that easily gain (steal) electrons tend to have low ionization energy and more than 4 valence electrons. Therefore, the correct option is option D.

The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.

118 known elements are present. A study is being done to create element 120.1. The periodic table will have to modified to include element 120 after it has been created and validated. Elements that easily gain (steal) electrons tend to have low ionization energy and more than 4 valence electrons.

Therefore, the correct option is option D.

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B. "The change in"

I saw that symbol a lot in chemistry and physics so I immediately recognized it.

Answer:

Explanation:

Melting and boiling point variations are not clear (do not have uniform pattern) in periodic table. But we can see, some elements have higher melting and boiling points and some have less. Here we study melting and boiling points of s, p, d blocks elements. IVAth group elements (C,Si) show high melting and boiling points because they have covalent gigantic lattice structures.

Answer:

The negative electrodes (cathodes ) and the positive electrodes (anodes ) are made of graphite, a form of carbon. During electrolysis: positively charged aluminium ions gain electrons from the cathode, and form molten aluminium. oxide ions lose electrons at the anode, and form oxygen molecules.

Answer:

Kinetic energy has a direct relationship with mass, meaning that as mass increases so does the Kinetic Energy of an object. ... Objects with greater mass can have more kinetic energy even if they are moving more slowly, and objects moving at much greater speeds can have more kinetic energy even if they have less mass

Answer: b . Covalent compounds can contain a maximum  of 4 different atoms.

Explanation:

The covalent compounds are those compounds that are formed between the non-metals via sharing of electrons. The bonds so formed between these non-metallic atoms are covalent. There can be two or several different kinds of atoms that can form covalent bonds with each other in a single molecule. They use the valence electrons for sharing. The maximum number of valence electrons can be seven.

Answer:

b.Covalent compounds can contain a maximum of 4 different atoms.

Explanation:

Covalent compounds can contain as little as the Covalent compounds can contain a maximum of 4 different atoms.

Therefore , the correct answer is B.

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Answer:

Hydrogen, 0,2 mol

Explanation:

[tex]V_{M}[/tex] = 22, 4 l/mol

V ([tex]N_{2}[/tex]) = 6,72 [tex]dm^{2}[/tex] = 6,72 l

V ([tex]H_{2}[/tex]) = 6,72 [tex]dm^{2}[/tex] = 6,72 l

The formula is:

n = [tex]\frac{V}{V_{M} }[/tex]

n  ([tex]N_{2}[/tex]) = 6,72l /22,4 l/mol = 0,3 mol

n  ([tex]H_{2}[/tex]) = 6,72l /22,4 l/mol = 0,3 mol (the same)

But from the equation we get a proportion that 1 mol  ([tex]N_{2}[/tex]) - 3 mol ([tex]H_{2}[/tex])

[tex]\frac{0,3}{1} > \frac{0,3}{3}[/tex] (we have more hydrogen than is need for the reaction)

So there is excess of [tex]H_{2}[/tex]

We only need  [tex]\frac{0,3}{3}[/tex] = 0,1 mol ([tex]H_{2}[/tex])

0,3 mol (hydrogen quantity we have) - 0,1 mol (hydrogen quantity we need for the reaction) = 0,2 mol (excess)

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Answer:

The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).

Answer:

Hydrogen Bonding

Explanation:

The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).

The reaction is not balanced

Given

Reaction

2Fe(s)+3O₂(g)⇒2Fe₂O₃(s)

Required

The number of atoms

Solution

In a balanced chemical equation, the number of atoms in the compound that reacts (the reactants and products) will have the same number

Reactants : Fe(s)+O₂(g)

Fe = 2 atoms

O = 3 x 2 = 6 atoms

Products : Fe₂O₃(s)

Fe = 2 x 2 = 4 atoms

O = 2 x 3 = 6 atoms

The reaction is not balanced because the number of Fe atoms is not the same

The balanced reaction should be:

4Fe(s)+3O₂(g)⇒2Fe₂O₃(s)

Answer:

False

Explanation:

Valence electrons depend of their what group they're in.

Answer: false

Explanation:

Because I looked it up

Explanation:

-plants that can absorb copper ions are grown on soil with low grade copper ores.

-the plants are burned and the copper compounds are within the Ash.

-copper ions can be leached from the Ash by adding sulphuric acid, this makes a solution of copper sulphate

-the displacement of scrap iron makes pure copper metals.

Plant Extraction (Plant Mining)

crops are grown in soil containing low-grade ore. Plants take up metal ions from the roots and concentrate these ions on the cells. The plants are harvested and burned. The remaining ash contains metal compounds.

Plants absorb metal ions from their roots in a process called plant mining. It removes toxic metals from contaminated soil-eg around old mines. In the future, when high-grade ore is depleted, it may extract metals by burning plants to produce ash.

How to extract copper from low-grade copper ore? Copper is extracted from low-grade copper ore by hydrometallurgy. Cu is treated with cast iron or H2 and leached by acid.

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Answer:

False

Explanation:

A series circuit is one that is all connected